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Hao L.,Qingdao University | Hao L.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Teng B.,Qingdao University | Teng B.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 10 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2016

4-N, N-dimethylamino-4'-N'-methyl stilbazolium tosylate (DAST) crystals were grown from methanol solutions added with toluene-sulfonic acid (PTSA). The metastable zone widths (MZW) of DAST solutions with and without PTSA were measured. It was found that PTSA could enhance the MZW significantly. The crystal structure and functional groups of the grown DAST were investigated by powder XRD and Fourier transform infrared (FTIR), respectively. The results indicated that PTSA did not change the crystal structure. The stability of solution with PTSA was helpful to the growth of large size DAST crystal. © 2016, Chinese Ceramic Society. All right reserved.


Wan Y.,Qingdao University | Wan Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Cai Z.-Y.,National University of Singapore | Jia M.-H.,Qingdao University | And 5 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Two kinds of non-closely packed binary colloidal crystal were fabricated using polystyrene (PS)particles as blocking units by improved vertical deposit method. The SEM images and reflectance spectra of the structure exhibit fine orderly structure obtained by this method. Using the non-closely packed PS colloid crystal as template, titania (TiO2) inverse opal was fabricated, which has high relative refractive index. ©, 2014, Chinese Ceramic Society. All right reserved.


Liu S.,Qingdao University | Liu S.-L.,Qingdao University | Long Y.-Z.,Qingdao University | Long Y.-Z.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 9 more authors.
Applied Physics Letters | Year: 2014

Ce-doped p-type ZnO nanofibers were synthesized by electrospinning and followed calcinations. The surface morphology, elementary composition, and crystal structure of the nanofibers were investigated. The field effect curve confirms that the resultant Ce-doped ZnO nanofibers are p-type semiconductor. A p-n heterojunction device consisting of Ce-doped p-type ZnO nanofibers and n-type indium tin oxide (ITO) thin film was fabricated on a piece of quartz substrate. The current-voltage (I-V) characteristic of the p-n heterojunction device shows typical rectifying diode behavior. The turn-on voltage appears at about 7 V under the forward bias and the reverse current is impassable. © 2014 AIP Publishing LLC.


Zhong D.,Qingdao University | Zhong D.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Teng B.,Qingdao University | Teng B.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 15 more authors.
Materials Research Bulletin | Year: 2013

A new series of Yb:YxLu1-xVO4 (x = 0.93, 0.85, and 0.71) mixed laser crystals were grown by the Czochralski method. Crystal structure analysis showed that Yb:YxLu1-xVO 4 crystals possessed the similar crystal structure to those of the tetragonal YVO4 and LuVO4. The polarized absorption spectra were measured at room temperature. The continuous-wave (CW) laser action of diode-pumped Yb:YxLu1-xVO4 mixed crystal laser was reported. A maximum output power of 1.19 W with a slope efficiency of 21.2% was demonstrated for the Yb:Y0.93Lu0.07VO 4 crystal. The laser emission spectra and relationship curves between the output power and absorbed pump power (Pabs) of Yb:Y xLu1-xVO4 (x = 0.93 and 0.71) crystals were measured. The laser damage threshold values and the optical quality of Yb:Y xLu1-xVO4 mixed crystal were also studied. © 2013 Elsevier Ltd. All rights reserved.


Kong W.,Qingdao University | Kong W.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Cao K.,Qingdao University | You C.,Qingdao University | And 6 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

An anti-reflective grating used for solar cell is proposed based on SiO2/TiO2 film to reduce its surface loss. It consists of substrate, relief structure and surface thin film. Rigorous coupled wave theory and genetic algorithm are employed to optimize the parameters such as groove depth, duty cycle, incident angle and thickness of surface thin film according to the merit function of the weighted average reflectivity. The optimized grating has the lower weighted average reflectivity than 2.16% with the incident wavelength from 300 nm to 1100 nm and the incident angle around ±40°. The lowest weighted average reflectivity is only 1.04%. Simulation results show sufficient manufacture tolerance of the designed grating.


Liu J.,Qingdao University | Liu J.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Chen X.,Qingdao University | Chen X.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 6 more authors.
Optics Express | Year: 2013

An efficient, acousto-optically Q-switched, and compact Yb:Gd 3Ga5O12 laser oscillating around 1026 nm is demonstrated, producing an output power of 5.15 W at a pulse repetition rate of 2 kHz, with optical-to-optical and slope efficiencies being 35.8% and 52%, respectively. The generated laser pulses are 6.4 ns in duration (FWHM), with pulse energy and peak power amounting, respectively, to 2.58 mJ and 403 kW. ©2013 Optical Society of America.


Guo Y.,Qingdao University | Guo Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Wan Y.,Qingdao University | Wan Y.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 4 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Magnonic crystals are a new class of artificial magnetic material with periodicity, and the flow of spin waves can be manipulated by designing. The research history and basic mechanism of magnonic crystals were reviewed in this paper. The research progress and the main research direction at present are summarized; the challenges of the further research were analyzed, and the development foreground of magnonic crystals was forecasted.


Bing T.,Qingdao University | Bing T.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Wei-Jin K.,Qingdao University | Wei-Jin K.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 11 more authors.
Journal of Nanoelectronics and Optoelectronics | Year: 2015

4-N,N-diethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) crystals were grown by slop nucleation method (SNM) in the experiments, achieving DAST crystal with the dimension of up to 5 ×5 × 2 mm3. The as-grown DAST crystals were characterized by powder X-ray diffraction (XRD) and Nuclear Magnetic Resonance (NMR). The (001) face morphology of DAST was analyzed, and the growth layers and hillocks were observed on the crystal surface. Moreover, the continuously tunable THz waves ranging from 1.16∼16.71 THz were generated from DAST crystal with 1 mm using the difference frequency method. The maximum THz output energy of 27.4 nJ was received at 3.8 THz. Copyright © 2015 American Scientific Publishers All rights reserved.


Liu S.-L.,Qingdao University | Long Y.-Z.,Qingdao University | Long Y.-Z.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Huang Y.-Y.,Qingdao University | And 6 more authors.
Polymer Chemistry | Year: 2013

Solvent recovery is a big challenge for industrial-level production of ultrathin fibers by solution electrospinning because more than 70 wt% of the precursor solution is volatilizable organic solvent. In this paper, we report an interesting solventless electrospinning technique for the fabrication of poly(ethyl-2-cyanoacrylate)/polymethylmethacrylate (PECA/PMMA) fibers. The spinning solution only contains two components: ethyl-2-cyanoacrylate (ECA) monomer and PMMA, which are nearly all (>90%) electrospun into fibers at room temperature. The fiber solidification mechanism during the electrospinning process could be ascribed to the rapid polymerization of the ECA monomer in the presence of water vapour (specifically hydroxide ions) in the atmosphere, which is quite different from the conventional solvent evaporation in solution electrospinning or the fiber cooling mechanism in melt electrospinning. In addition, the morphology, structure, and influence of temperature and PMMA concentration have also been studied. The results may give some stimulation for developing new ecofriendly electrospinning methods. © 2013 The Royal Society of Chemistry.


Liu S.-L.,Qingdao University | Long Y.-Z.,Qingdao University | Long Y.-Z.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | Zhang Z.-H.,Qingdao University | And 8 more authors.
Journal of Nanomaterials | Year: 2013

Uniaxially aligned and cross-aligned arrays of ultrafine polymer fibers have been fabricated by a novel and effective centrifugal electrospinning setup with rotating polymer solution jets. Comparing with conventional electrospinning (10-30 kV) and centrifugal spinning (4,000-12,000 rpm), this technique only requires a lower working voltage (2.8-6.0 kV), a slower rotational speed (360-540 rpm), and a shorter spinning distance (2.0-4.0 cm). In addition, the influences of experimental parameters such as working voltage, rotational speed, collecting distance, and solution concentration on the alignment of the as-spun fibers are investigated using image analysis techniques. It is found that the working voltage and rotational speed mainly influence the perpendicular and linear velocities of the fibers, respectively. The polymer fibers tend to show higher alignment degree when these two velocities are very close. Optimum conditions (working voltage 3.0 kV, rotational speed 420 rpm, collecting distance 2.5 cm, and solution concentration 18 wt%) to maximize alignment degree (97%) of polystyrene fibers are also obtained. © 2013 Shu-Liang Liu et al.

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